Naslov
Wind-tunnel simulations of the ABL flow, cross-wind gusting of vehicles, design of road wind barriers

Autori
Kozmar, Hrvoje

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Department of Civil and Environmental Engineering, Florida International University

Mjesto i datum
Miami (FL), Sjedinjene Američke Države, 03.04.2012

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
Wind-tunnel experiments; atmospheric boundary layer; wind gusting of vehicles; design of road wind barriers

Sažetak
Precise wind-tunnel simulation of the atmospheric boundary layer (ABL) flow is a key prerequisite for successful small-scale experimental studies on micrometeorology, wind loading of structures, dispersion of air pollutants, wind farms’ design. Numerous methods for ABL wind-tunnel simulations have been developed since the 1960s. In general, a common procedure is to force the flow to pass through/over a combination of objects, which results in airflow similar to natural winds. The approaches most commonly used in practice are the Irwin (1981) and Counihan (1969) methods. In this seminar, basics of the ABL flow will be given, a concept of the Counihan method will be reported, experimental results obtained at Munich University of Technology, Germany, using newly developed (truncated Counihan) vortex generators will be presented. A major threat to traffic in coastal Croatia is a strong, cold and gusty bora wind. Its most prominent feature is strong gustiness. In severe bora cases mean hourly wind speeds average 17 m/s, while gust velocities as large as 69 m/s were observed. In the NatHaz Lab at University of Notre Dame transient aerodynamic loads on a vehicle were simulated. Two different unsteady aerodynamic loading phenomena were reported originating from periodicity of the simulated bora-wind gusting as well as from shed vortices from the bridge, and their interactions with the vehicle model. The relevant results will be presented and discussed. Wind-tunnel tests were carried out at University of Florence, Italy to determine an optimal aerodynamic design of wind barriers for Croatian freeway bridges. In this seminar, sheltering efficiency of wind barriers for different angles of attack, barrier porosity and height, design of barrier elements, incoming turbulence intensity will be reported.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Građevinarstvo, Tehnologija prometa i transport

POVEZANOST RADA